Cherry-pick 54408f5. rdar://problem/109368007

    [WebGPU] RemoteBuffer unmap should check the input vector
    https://bugs.webkit.org/show_bug.cgi?id=255350
    <rdar://107947502>

    Reviewed by Myles C. Maxfield.

    Ensure data vector passed to unmap is valid for the currently
    mapped buffer.

    * Source/WebKit/GPUProcess/graphics/WebGPU/RemoteBuffer.cpp:
    (WebKit::RemoteBuffer::unmap):

    Canonical link: https://commits.webkit.org/262895@main

Identifier: 245886.885@safari-7613.4.1.0-branch

Source/WebKit/GPUProcess/graphics/WebGPU/RemoteBuffer.cpp

@@ -71,7 +71,7 @@ void RemoteBuffer::mapAsync(PAL::WebGPU::MapModeFlags mapModeFlags, std::optiona
 
 void RemoteBuffer::unmap(Vector<uint8_t>&& data)
 {
-    if (!m_mappedRange)
+    if (!m_mappedRange || m_mappedRange->byteLength < data.size())
         return;
     ASSERT(m_isMapped);